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Replace crt coolant

I saw your post regarding how to replace crt coolant in proj tv

can i do this without removing the entire crt assembly including wire connections ..........i guess what im saying is can it be done somehow just filling and refilling inside the tv without having to yank everyhting out

thanks

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  • dcxguy48080 Jan 09, 2009

    thanks i have seen online people that have not taken out the crt assembly but i guess it depends on model and your mechanical level

    thank you......me personally taking them out would be a hell of a lot harder and more of a chance for damage since the boards and wires on those assemlies are very fragile......im going to leave them in and take a chance..it was a free tv if i ruin it then it will be the guinea pig and a learning experience

    thanks


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No, has to be taken all the way out, i wouldnt recomend you doing it, it takes about 4 hours to do correctily, also , after it is done, the whole alignment and geomitry have to be redone, pain in the but to do

Posted on Jan 09, 2009

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Changed crt coolant, better picture. red squiggily line starting at top center of screen, runs about a third of the way down. thought i saw scratch or small crack in green crt "c" lens. would this cau


Sounds like you may have just left one of the wires loose from the red tube. Not likely an issue from the gren tube but you can always cover the top of the lens and let just green shine up. That may help narrow it down also.

Here is more detailed info for you also.....

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

69189a5.pngSOLUTION

What you will need to do is replace the coolant and clean the crt. You can get a repair kit from TvRepairKits.com . It includes replacement coolant,step by step instructions, support, etc.

Jan 17, 2013 | Philips 60P8341 60" Rear Projection...

Tip

CRT projection TV lost vertical drive. Thin horizontal line only.


Your projection TV works but the only visible part is a thin horizontal line across the screen. What happened and how do you fix it?

Your problem is that you have no vertical drive, only a small horizontal line across the screen. In older projection TVs this is usually caused by broken solder joints in the area of the vertical IC and over the entire board. It could also be caused by a bad vertical IC. Let's approch this problem one step at a time.

Disconnect the power. Remove the back cover. Remove the board with the vertical IC which is usually the board with the high voltage transformer on it and it is usually on the right side of most TVs. You can also identify the proper board by looking for and following the wires from the yoke which is on the CRT neck. There should be a yellow, brown, green and red. The yellow and brown are the vertical wires.

Before removing any wires mark them with a sharpie or a label maker. Just make sure that you will be able to reassemble the unit without mixing up any wires.

Usually the board in question is on the right. It will be the one with the flyback on it. The flyback looks like a small cylinder with about 4 large wires coming off of it. They will be red rubber and flexible. One goes to each CRT.

You will need to remove the entire assembly to get to the underside of the boards to solder the unit or replace the vertical IC. Sometimes removing the restraints will allow enough room to flip the board over and do the work without removing all the connectors and removing the board.

Once the underside of the board is exposed, solder all connections on the boards. Be careful not to bridge any connections. Test the unit for proper operation.

If the unit still does not work properly replace the vertical IC. It usually begins with LA followed by 4 digits. It will be in the vicinity of the flyback probably towards the front of the board. The Ic will be attached to a large aluminim heat sink. Make sure that you do not bridge any of the circuits when soldering. Replace the IC, reassemble and test.

If things went well the unit should work ok.

Thanks for using FixYa and for the great rating. Please consider a testimonial. Thank you.

hardrocko

on Jan 19, 2011 | Philips Magnavox 50ML8105D 50" HDTV DLP TV

1 Answer

Magnavox rear proj (model# 8p6044 c102) pic is cloudy/green tint


Yes the coolant gets crud buildup in it over time which will cause the color and clarity to get very poor with obects that will glow around certain bright ojects. You can get the Phillips CRT coolant replacement kit from www.tvrepairworld.com which has the CRT coolant for all 3 CRTs and also includes the Cd with instructions on how to do the replacement.

Mar 27, 2010 | Projection Televisions

1 Answer

How do I disassemble a crt lense assy in proj tv? I have spider webs and bugs in all 3 assyd of my rear proj tv...


You will need to pull the complete crt assembly one at a time, Drain the coolant then remove the screws that secure the lens to the crt. But then you will need to replace the coolant. Do not try to loosen the lens while still in the TV or the CRT coolant will leak onto the chassis which can destroy the Chassis. You can get a CRT coolant kit at www.tvrepairworld.com which will contain the coolant and the Instructions.

Dec 12, 2009 | Projection Televisions

1 Answer

Philips Magnavox 55P8288A Green tinge over entire picture


Your TV most likely has one or more possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
701cb04.jpg
77ea520.jpg
f0900cb.jpg
Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

Apr 09, 2009 | Philips Magnavox 50ML8105D 50" HDTV DLP TV

2 Answers

Changing the CRT coolant


There's a forum here. A little way down the page is a post with a pdf attachment describing the process for changing the coolant. It's tedious and messy but not too difficult. (When I was a road TV tech I did these changes in about 90 minutes.)

In a nutshell the process is to use a turkey baster or suction bulb to remove most of the old coolant from the chamber attached to each tube. Then remove the chamber, clean the tube face and chamber surfaces. Replace the chamber, refill the coolant, then touch up any convergence as necessary.

The pdf gives a good detailed procedure. Replacement coolant is available from several sources. I deal frequently with MCM Electronics (www.mcminone.com).

Good luck with the project. It's well worth the effort when you see the picture after you're done.

Mar 27, 2009 | Philips 60PP9202 60" Rear Projection...

1 Answer

Philips rear proj tv multipoint help


Your TV most likely has one or more possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
701cb04.jpg
77ea520.jpg
f0900cb.jpg
Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

Jan 01, 2009 | Philips 51PP9303H Rear Projection...

4 Answers

Procedure for replacing fluid in our rear projection television


Changing Projection TV Coolant
1. Tip the TV set so the expansion chambers are pointed up. The expansion chamber is a small white/clear plastic bulb-like thing
that is attached to one side of each of the CRT's up near the top lens. In some TVs, the expansion chambers are already pointed
up - In this case you don't have to tip the TV.
Or if you find this difficult remove all 3 CRT tubes from the metal cradle they are screwed to & lift each tube completely out you will need to unplug & disconect all leads from the crt.
2. Cover the circuit boards below the CRT's with several paper towels to prevent accidentally spilling any coolant onto the boards.
The coolant is corrosive and will destroy the circuit boards. Don't skimp on the paper towels here - they are cheap!!!
3. Remove the four screws that hold on the focusing lens assembly and remove the focusing lens assembly.
4. Note the position of the expansion chamber then remove the expansion chamber. It will need to be reinstalled in the exact
same position so remember the position or take a picture if you need to. There is a small o-ring on the neck of the expansion
chamber where it threads onto the CRT housing - Don't loose it!
5. Use the baster and tube to suck the fluid out from the hole where the expansion chamber was removed. This hole is fairly small...
maybe 5/16" or so.
6. Once most of the fluid is out, remove the four screws that hold on the lens cover plate.
7. Remove the lens cover plate, the lens & the large o-ring. (be gentle with the o-rings!!!)
8. Clean the CRT chamber & lens with denatured alcohol. Use 100% cotton balls so you don't scratch anything.
9. Clean the CRT chamber and lens with distilled water. Again, use 100% cotton balls so you don't scratch anything. This will rinse
out the alcohol residue. You need to use distilled water for this so there is no mineral residue.
10. Gently clean the large o-ring with distilled water (don't use the alcohol because it might eat the o-ring) Dry off the o-ring and
lightly coat it with 100% pure silicone (not siliconized acrylic caulking or acrylic latex caulking - ONLY USE 100% SILICONE).
Use your fingers to rub a thin layer of silicone all over the surface of the o-ring. Then place the o-ring in the groove in the CRT
housing.
11. Place the lens in its position on the o-ring.
12. Place the lens cover plate over the lens and install the four screws.
13. Clean your baster and tubing with denatured alcohol then rinse with distilled water.
14. Use the baster and tube to suck clean fluid from the bottle and install it into the CRT through the expansion chamber hole. Go
really slow when it is almost full to minimize overflow. Wipe up any overflow immediately. There will be a small air pocket in
the CRT when you are done - you will not be able to fill the chamber 100% - This is O.K. Just be sure to fill it as far as possible
so the fluid is just up to the edge of the expansion chamber hole.
15. Install the expansion chamber. Be sure to install it in the same position as it was before you removed it. Also be sure that the
small o-ring is on the neck of the chamber before you thread it on. The chamber is just plastic so don't over-tighten it or you
might damage it. Screw it on as tight as you can go by hand and then give it about 1/8 of a turn with pliers. (you might have to
use needle-nose pliers to get a good grip on it.)
16. Place the focusing lens assembly into position and install the four screws.
17. Turn on the TV and check for leaks over the next 20 minutes. Remember, you have not yet removed all the paper towels from
inside the TV. Remove these once you know there are no leaks.
Other things that should be done after replacing the fluid include...
1. Clean the mirror
2. Clean the top lenses of the focusing assemblies
3. Focus the CRT's
4. Adjust the convergence
Here is a list of things you will need:
1. Turkey baster
2. Vinyl tube
3. Cooling Fluid
4. 100% cotton balls
5. Paper towels
6. Denatured alcohol
7. Distilled water
8. Pliers
9. Screw driver
Ensure you use only the coolant made specificaly for projection CRTs

http://dysonmanuals.llc.nu/

Chris..

Jan 12, 2008 | Projection Televisions

1 Answer

Magnavox 6p5441c103 rear proj.tv


You can get it a stores online like Vancebaldwin.com, Mcmelectronics.com, Bluestar-online.com, or any electronic shop. It is called CRT Coolant, you will need about 3 or 4 bottles. It is really important to not waste on board, because this may short out set.

Dec 21, 2007 | Philips Magnavox 51MP392H Rear Projection...

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